CVE-2026-52946 (GCVE-0-2026-52946)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:26 – Updated: 2026-06-29 04:24
VLAI
Title
fs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling A SOFTIRQ-safe to SOFTIRQ-unsafe lock order deadlock can occur in send_sigio() and send_sigurg() when a process group receives a signal. When FASYNC is configured for a process group (PIDTYPE_PGID), both functions use read_lock(&tasklist_lock) to traverse the task list. However, they are frequently called from softirq context: - send_sigio() via input_inject_event -> kill_fasync - send_sigurg() via tcp_check_urg -> sk_send_sigurg (NET_RX_SOFTIRQ) The deadlock is caused by the rwlock writer fairness mechanism: 1. CPU 0 (process context) holds read_lock(&tasklist_lock) in do_wait(). 2. CPU 1 (process context) attempts write_lock(&tasklist_lock) in fork() or exit() and spins, which blocks all new readers. 3. CPU 0 is interrupted by a softirq (e.g., TCP URG packet reception). 4. The softirq calls send_sigurg() and attempts to acquire read_lock(&tasklist_lock), deadlocking because CPU 1 is waiting. Since PID hashing and do_each_pid_task() traversals are already RCU-protected, the read_lock on tasklist_lock is no longer strictly required for safe traversal. Fix this by replacing tasklist_lock with rcu_read_lock(), aligning the process group signaling path with the single-PID path. This also mitigates a potential remote denial of service vector via TCP URG packets. Lockdep splat: ===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected [...] Chain exists of: &dev->event_lock --> &f_owner->lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&dev->event_lock); lock(&f_owner->lock); <Interrupt> lock(&dev->event_lock); *** DEADLOCK ***
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 54626335ea4174ab2d9a183b511d825f6765e47b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 897d6a7247739fb1528f98c575df4f2e5de7f994 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 32dbd5ce4be3a3ed7e00f8af18795cc84fc50a33 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b5fa9e32fb6718f70c986ee14dd5d01b4846f331 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1bee417678f1135e35b25a37734db46aa94258d2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 20a93e397abe850c49b6fa0e8cc827b5f634a8f5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < bfcc8e8d8a495bb34cae9e620adfb75fb13a3954 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 36c1b57b2ecf3c61ac93f5f07bd29b6f21e226ed (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 00633c4683828acd5256fa8d5163f440d74bbe71 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1.1 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling\n\nA SOFTIRQ-safe to SOFTIRQ-unsafe lock order deadlock can occur in\nsend_sigio() and send_sigurg() when a process group receives a signal.\n\nWhen FASYNC is configured for a process group (PIDTYPE_PGID), both\nfunctions use read_lock(\u0026tasklist_lock) to traverse the task list.\nHowever, they are frequently called from softirq context:\n- send_sigio() via input_inject_event -\u003e kill_fasync\n- send_sigurg() via tcp_check_urg -\u003e sk_send_sigurg (NET_RX_SOFTIRQ)\n\nThe deadlock is caused by the rwlock writer fairness mechanism:\n1. CPU 0 (process context) holds read_lock(\u0026tasklist_lock) in do_wait().\n2. CPU 1 (process context) attempts write_lock(\u0026tasklist_lock) in\n   fork() or exit() and spins, which blocks all new readers.\n3. CPU 0 is interrupted by a softirq (e.g., TCP URG packet reception).\n4. The softirq calls send_sigurg() and attempts to acquire\n   read_lock(\u0026tasklist_lock), deadlocking because CPU 1 is waiting.\n\nSince PID hashing and do_each_pid_task() traversals are already\nRCU-protected, the read_lock on tasklist_lock is no longer strictly\nrequired for safe traversal. Fix this by replacing tasklist_lock with\nrcu_read_lock(), aligning the process group signaling path with the\nsingle-PID path. This also mitigates a potential remote denial of\nservice vector via TCP URG packets.\n\nLockdep splat:\n=====================================================\nWARNING: SOFTIRQ-safe -\u003e SOFTIRQ-unsafe lock order detected\n[...]\nChain exists of:\n  \u0026dev-\u003eevent_lock --\u003e \u0026f_owner-\u003elock --\u003e tasklist_lock\n\nPossible interrupt unsafe locking scenario:\n       CPU0                    CPU1\n       ----                    ----\n  lock(tasklist_lock);\n                           local_irq_disable();\n                           lock(\u0026dev-\u003eevent_lock);\n                           lock(\u0026f_owner-\u003elock);\n  \u003cInterrupt\u003e\n    lock(\u0026dev-\u003eevent_lock);\n\n*** DEADLOCK ***"
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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        "dateUpdated": "2026-06-29T04:24:16.044Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/00633c4683828acd5256fa8d5163f440d74bbe71"
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      ],
      "title": "fs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52946",
    "datePublished": "2026-06-24T16:26:04.419Z",
    "dateReserved": "2026-06-09T07:44:35.371Z",
    "dateUpdated": "2026-06-29T04:24:16.044Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-52946",
      "date": "2026-07-02",
      "epss": "0.00612",
      "percentile": "0.44919"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-52946\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:04.610\",\"lastModified\":\"2026-06-29T06:16:29.447\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs/fcntl: fix SOFTIRQ-unsafe lock order in fasync signaling\\n\\nA SOFTIRQ-safe to SOFTIRQ-unsafe lock order deadlock can occur in\\nsend_sigio() and send_sigurg() when a process group receives a signal.\\n\\nWhen FASYNC is configured for a process group (PIDTYPE_PGID), both\\nfunctions use read_lock(\u0026tasklist_lock) to traverse the task list.\\nHowever, they are frequently called from softirq context:\\n- send_sigio() via input_inject_event -\u003e kill_fasync\\n- send_sigurg() via tcp_check_urg -\u003e sk_send_sigurg (NET_RX_SOFTIRQ)\\n\\nThe deadlock is caused by the rwlock writer fairness mechanism:\\n1. CPU 0 (process context) holds read_lock(\u0026tasklist_lock) in do_wait().\\n2. CPU 1 (process context) attempts write_lock(\u0026tasklist_lock) in\\n   fork() or exit() and spins, which blocks all new readers.\\n3. CPU 0 is interrupted by a softirq (e.g., TCP URG packet reception).\\n4. The softirq calls send_sigurg() and attempts to acquire\\n   read_lock(\u0026tasklist_lock), deadlocking because CPU 1 is waiting.\\n\\nSince PID hashing and do_each_pid_task() traversals are already\\nRCU-protected, the read_lock on tasklist_lock is no longer strictly\\nrequired for safe traversal. Fix this by replacing tasklist_lock with\\nrcu_read_lock(), aligning the process group signaling path with the\\nsingle-PID path. This also mitigates a potential remote denial of\\nservice vector via TCP URG packets.\\n\\nLockdep splat:\\n=====================================================\\nWARNING: SOFTIRQ-safe -\u003e SOFTIRQ-unsafe lock order detected\\n[...]\\nChain exists of:\\n  \u0026dev-\u003eevent_lock --\u003e \u0026f_owner-\u003elock --\u003e tasklist_lock\\n\\nPossible interrupt unsafe locking scenario:\\n       CPU0                    CPU1\\n       ----                    ----\\n  lock(tasklist_lock);\\n                           local_irq_disable();\\n                           lock(\u0026dev-\u003eevent_lock);\\n                           lock(\u0026f_owner-\u003elock);\\n  \u003cInterrupt\u003e\\n    lock(\u0026dev-\u003eevent_lock);\\n\\n*** DEADLOCK ***\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/fcntl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"54626335ea4174ab2d9a183b511d825f6765e47b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"897d6a7247739fb1528f98c575df4f2e5de7f994\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"32dbd5ce4be3a3ed7e00f8af18795cc84fc50a33\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"b5fa9e32fb6718f70c986ee14dd5d01b4846f331\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"1bee417678f1135e35b25a37734db46aa94258d2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"20a93e397abe850c49b6fa0e8cc827b5f634a8f5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"bfcc8e8d8a495bb34cae9e620adfb75fb13a3954\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"36c1b57b2ecf3c61ac93f5f07bd29b6f21e226ed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"00633c4683828acd5256fa8d5163f440d74bbe71\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/fcntl.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.1\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00633c4683828acd5256fa8d5163f440d74bbe71\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1bee417678f1135e35b25a37734db46aa94258d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/20a93e397abe850c49b6fa0e8cc827b5f634a8f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/32dbd5ce4be3a3ed7e00f8af18795cc84fc50a33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/36c1b57b2ecf3c61ac93f5f07bd29b6f21e226ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54626335ea4174ab2d9a183b511d825f6765e47b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/897d6a7247739fb1528f98c575df4f2e5de7f994\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b5fa9e32fb6718f70c986ee14dd5d01b4846f331\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bfcc8e8d8a495bb34cae9e620adfb75fb13a3954\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.